<?php
class LtCacheAdapterFile implements LtCacheAdapter
{
    public function connect($hostConf)
    {
        $fileStore = new LtStoreFile;
        $fileStore->prefix = 'LtCache-file';
        $fileStore->useSerialize = true;
        $fileStore->init();
        return $fileStore;
    }

    public function add($key, $value, $ttl = 0, $tableName, $connectionResource)
    {
        if (0 != $ttl)
        {
            $ttl += time();
        }
        if (true == $connectionResource->add($this->getRealKey($tableName, $key), array("ttl" => $ttl, "value" => $value)))
        {
            return true;
        }
        else
        {
            if ($this->get($key,$tableName,$connectionResource))
            {
                return false;
            }
            else
            {
                $this->del($key,$tableName,$connectionResource);
                return $connectionResource->add($this->getRealKey($tableName, $key), array("ttl" => $ttl, "value" => $value));
            }
        }
    }

    public function del($key, $tableName, $connectionResource)
    {
        return $connectionResource->del($this->getRealKey($tableName, $key));
    }

    public function get($key, $tableName, $connectionResource)
    {
        $cachedArray = $connectionResource->get($this->getRealKey($tableName, $key));
        if (is_array($cachedArray) && (0 == $cachedArray["ttl"] || $cachedArray["ttl"] > time()))
        {
            return $cachedArray["value"];
        }
        else
        {
            return false;
        }
    }

    public function update($key, $value, $ttl = 0, $tableName, $connectionResource)
    {
        if (0 != $ttl)
        {
            $ttl += time();
        }
        return $connectionResource->update($this->getRealKey($tableName, $key), array("ttl" => $ttl, "value" => $value));
    }

    protected function getRealKey($tableName, $key)
    {
        return $tableName . "-" . $key;
    }
}
